Series EFS2 Insertion Electromagnetic Flow Sensor

No Moving Parts, Durable, Easy Installation & Maintenance, 1 to 12" Pipe (25 to 305 mm)

The SERIES EFS2 Insertion Electromagnetic Flow Sensor is designed for pipe sizes from 1 to 12" and comes in three different materials (stainless steel, brass and PVC). There are a variety of custom fittings to choose from to ensure accurate fitting in the pipe. The Series EFS2 is useful for any applications where moving parts would be a problem, such as dirty liquids. It can handle applications where there are rapid changes in viscosity and flow. Other applications include small pipes and chemical metering pumps.

The EFS2 is a liquid flow meter that uses the conductivity of fluids to measure flow rate. Liquid flow through its magnetic field produces a voltage that is measured and translated into an output signal. It has a pulse frequency output which can be used with the Series RTI to indicate flow rate and total, as well as the Series BAT signal converter which provides an analog signal.

Series BAT, Blind Analog Transmitter, converts pulse output to 4 to 20 mA analog output. Unit is loop powered, fits on the enclosure of the meter, and is fields spannable.
Series RTI2, Rate Total Indicator, converts pulse output to 4 to 20 mA analog output with local flow rate and totalization display. Unit is loop powered, can fit on the enclosure of the meter, and provides a high/low flow alarm.
Series PWD, Pulse Divider, for use with pacing electronic metering pumps. Unit divides the input frequency to any number from 1 to 9999 with the use of rotary switches to suit a number of metering pump inputs.

Note: Need to purchase with Series EFF fitting for proper installation.

California Residents:  Click Here for Proposition 65 WARNING.

Product Applications

  • Contaminated liquid flow monitoring
  • Flow of conductive liquids
  • Water & wastewater treatment
  • Industrial systems
  • Irrigation applications
  • Telemetry applications

Models & Ordering

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Shipping Information

All shipping times are dependent on product availability at time of shipment.

Although we make every effort to ensure a continuous supply of our products, occasional circumstances may force us to temporarily run out of a product, or have shipping delays. Should this occur, customers will be notified soon after placement of any orders for such products and, if applicable, items will be put on backorder. For orders requiring expedited shipment, our customer service team can be contacted to confirm product availability

COVID-19 Update: Due to high customer demand, lead time on some products may be up to two weeks. While this is a developing health situation, we are working continuously to take the necessary measures to ensure that the products you need are available with minimal interruption.

Build Your Custom Part. Use our Product Configurator

Model Description Usually Ships* Price Code Order
Ships: Consult Factory
Price: $991.50
1 to 3" Pipe, Brass Consult Factory* $991.50 B Order
Ships: Consult Factory
Price: $907.00
1 to 3" Pipe, PVC Consult Factory* $907.00 B Order
Ships: Consult Factory
Price: $1,016.00
1 to 3" Pipe, 316 SS Consult Factory* $1,016.00 B Order

Can't find what you need? Build Your Custom Part. Use our Product Configurator


Compatible clean or dirty non-coating, conductive liquids.
0.28 to 20 ft/s (0.08 to 6.09 m/s).
Wetted Materials:
Sensor: 316 SS, brass or PVC;
Electrodes: Hastelloy®, metal;
Electrode Cap: PVDF;
O-ring: EPDM (fluoroelastomer optional).
±1% FS.
Temperature Limits:
Process: Brass/SS: 32 to 200°F (0 to 93°C);
PVC: 32 to 130°F (0 to 55°C);
Ambient: 0 to 160°F (-17 to 72°C).
Pressure Limits:
Brass/SS: 200 psi (13.8 bar);
PVC: 150 psi (10 bar).
Process Connection:
See Series EFF.
Current sinking, square wave pulse, opto-isolated, 550 Hz @ 20 ft/s.
Power Requirements:
12 to 25 VDC @ 250 mA; (12 to 25 VDC @ 40 mA (max. 250 mA) - LOP option).
Electrical Connection:
Terminal block.
20 microSiemens/cm.
Enclosure Material:
Housing: Die-cast powder-coated aluminum.
Enclosure Rating:
NEMA 4X (IP66).
3 lb (1361 g).


  • Long life cycle and less frequent maintenance with no moving parts to wear or break and electrodes that discourage fouling
  • Unaffected by change in temperature, density, viscosity or concentration
  • Pulse output for use with a variety of displays and controllers for remote reading
  • Easy meter mount display and transmitter accessories for local indication and analog 4 to 20 mA output


Model Chart

EXAMPLE EFS2 1 P RFO Series EFS2-1P-RFO Insertion Electromagnetic Flow Sensor
SERIES EFS2       Insertion Electromagnetic Flow Sensor
SIZE   1
    1 to 3 inch pipe
4 to 10 inch pipe
12 in pipe
Fluoroelastomer o-ring
Low power
Reverse flow output

Product Literature


Catalog Pages



EFS2 flow meter in PVC. Is this NSF rated?
The EFS2 does not have an NSF rating.

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